Adhesive Polymer Composition for Multilayer Pipe Peel Strength
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Solution Overview
Problem
Multilayer structures face adhesion issues between layers of different materials, leading to potential delamination, especially at higher service temperatures, and existing adhesive polymer compositions do not adequately address these challenges with respect to processability and temperature range.
Innovation Solution
A specific adhesive polymer composition comprising a non-elastomeric copolymer of ethylene and alpha-unsaturated olefins, combined with an elastomeric ethylene copolymer, both grafted with an acid grafting agent, which provides improved adhesion properties and processability across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive layers are used between different material layers, then adhesion between layers is improved, but delamination occurs at higher service temperatures
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight distribution (Mw/Mn between 2.0-4.0) and density (0.925-0.945 g/cm³) of the polyethylene copolymer, as well as the comonomer content (3-15 wt%), to achieve optimal adhesion properties that remain stable across a wide temperature range including high service temperatures
Solution Approach 2:
The patent uses a composite material approach by combining polyethylene with specific comonomers (such as vinyl acetate, acrylic acid, or maleic acid) in controlled amounts to create a copolymer that exhibits both good adhesion to different substrates and maintained structural integrity at elevated temperatures, preventing delamination
2Strength
If adhesive layers are added to multilayer structures, then adhesion between different material layers is improved, but processability and temperature processing window are reduced
Solution Approach 1:
The patent optimizes the molecular weight distribution and density parameters of the polyethylene copolymer to achieve a balance between adhesion performance and processability, allowing the adhesive layer to be processed within a wide temperature window while maintaining strong bonding capabilities
Solution Approach 2:
The patent introduces local quality by incorporating specific comonomer units at controlled concentrations (3-15 wt%) within the polyethylene matrix, creating localized regions that enhance adhesion without compromising the overall processability and temperature processing window of the adhesive material
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adhesive polymer composition achieves enhanced peel strength values at elevated temperatures (80 °C and 90 °C) and maintains good mechanical properties, with a wide temperature processing window and improved comonomer distribution, reducing the likelihood of delamination.
Implementation Method 1
both grafted with an acid grafting agent
Data Source
AI summary
An adhesive polymer composition comprising a non-elastomeric copolymer of ethylene and one or more comonomers having 3 to 10 carbon atoms, and an elastomer is disclosed herein. The non-elastomeric copolymer is present in an amount of 60 to 95 % by weight, based on the adhesive polymer composition, has a molecular weight distribution Mw/Mn of more than 2.5 up to 6.0, a density of from 0.925 to 0.945 g/cm3, and more than 0.1 up to 0.6 vinyl groups/ 1000 carbon atoms. The non-elastomeric copolymer or the non-elastomeric copolymer and the elastomer have been grafted with an acid grafting agent. The adhesive polymer composition may be used in an adhesive layer of a multilayer structure of a pipe such as a coated metal pipe improving peel strength of the adhesive layer at elevated temperatures.